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C. F. HANSEN.

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1,320,002. mum mocmm :Patented 0m. 28,1919.

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I-I'I I II F I I III I. mvemon Fag 4- umuzs nuausgu I CHARLES F. HANSEN, 0F SEATTLE, WASHINGTON.

FIRELESS COOKER Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed October 12, 1918. Serial No. 257,905.

solution of waterglass, afl'ording a non-- conducting inclosure for the cooking receptacles and food, and an inexpensive and portable cooker.

I attain these objects by the devices illustrated in the accompanying drawing, in

which- Figure 1 is a. vertical section of a. three compartment cooker. Fig. 2, perspective of one of the plates-for holding the cooking receptacles in place. Fig. 3, perspective of one of the e linders for cooking receptacles of varying ameters. Fig. 4, elevation of'a two compartment cooker complete. Fig. 5 cross section of superimposed layers of paper and corrugated strawboard of which the structure. is composed.

Similar numerals refer to similar parts throughout the several views.

The body of the cooker 2 consists of superimposed sheets of pa er and corrugated strawboard, or the li e, which have been previously soaked in a solution of waterglass to render the material an insulator of air and heat. These are rolled to form a cylinder, the cylinder being stren hened and held in form by the metal ic band 23. In this cooker the insulating material and the casing are one and the same thing, so it is important that no nails or other fastenings penetrate the body of the structure. The metallic band 11 extends underneath the band '23 down one side of the body across the bottom thereof and up the other side ending underneath the band 23. This band gives additional strength to the body and affords means for attaching the handles. After these bands are in lace layers of the treated paper are fasten around the c linder to cover up the bands and to 've t e bod a smooth contour. The ban es 1 are t ion applied. A cross section of a portion of thecombined casing and insulating material as itappears in the main body of the de vice is shown in Fig. 5. The base of the structure 12 is formed by winding several thicknesses of the prepared material around the main body, and fastenin and smoothmg the same by several thic esses of the prepared paper. The bottom 26 and top of the cover 25 are formed of the same material, but to give more rigidity, the corrugated board is solaid that the corrugations are transverse to each other in each successive layer. The plates represented by 13, 13', 14 and 15 are also made in the same insulating material, and in addition to afford seats for the two plates 13 and 14. Fig. 3 represents a cylinder 0 en at both ends, several of which, in di erent sizes, are furnished with the device. They are constructed of the same material and in practically the same manner as the main body. In a fireless cooker it is desirable that the insulatin material be packed as closely to the coo ing receptacles as possible. so these cylinders of varying size are provided to fit larger or small utensils as the cooking requires, and also to completely fill up the cooker with insulating material around the sides of the utensils. The recesses 27 and 27' are to aii'ord space for cars or projections at the upper portion of the cooking receptacles and to permit the insulating cylinder to fit closely to the cooking receptacle. Fig. 1 shows the device all assembled and ready for cooking. 15*represcnts a plate as per Fig. 2 restin on the bottom of the cooker, 10 is a cylinder as per Fig. 3 placed directly over the plate 15, within the cylinder is placed the cooking receptacle 17, over these, and resting on the recess 7 is )laced the plate 14. On to of 14 is placed the plate 13'. As the coo ing utensil 16 is of smaller diameter than the cooking receptacle 17, two insulating cylinders 8 and 9. are placed over the same. On

top of these is placed a plate of larger diameter, 13, which rests on the metal covered recess 7. The cooking utensil 6 placed thereon being of larger diameter than 16 but one insulat cylinder is required. With artially cooks and well heated food place in the diiferentcookin and the cover in position t e apparatus is ready for coo Particular attention is called to the novel construction of this fireless cooker. The whole structure, with the exception of the annular sheet metal rin at 7, the bands 11, 23 and the handles 1, 18 made of superimposed sheets of paper, andcorrugated board which have been rendered non-conductive of heat and air by treated with a solution of, waterg ass. 1; is lighter in weight, more portable and costs less money to build than an 1 other fireless cooker The annular rings 0 sheet metal at 7 cover any exposed air 5 aces made by cutting out the recesses whic aflord rests for the plates which support the cooking receptacles. An other of .together by suitable means.

the air spaces in the body mom er which might be exposed during construction are covered with the insulating material, hence the main body afiords astructure filled with dead air spaces as shown in the cross sec: tion 5, sealed with non-conducting material. The insulating cylinders Fig. 3' are practically of the same construction as the main In the construction ofthe top, bottom and the support plates alternate sheets of the corrugated ard are laid so that the corru tions are transverse to those immediately a Va and below. This is done in order to give greater ri i'dity, the arrangement of the air spaces eing approximately the same as is shown in the sectional view Fig. 1. The plates are of a form to snugly fit the member with which they are adapted to be used, and the layers fastened Should any space exist between the top of a cooking receptacle and a supporting plate directly above, when the same are assembled; the inventor furnishes with the device pads made of the insulating material, to completely fill these spaces. Or, the operator can use cloths for the same purpose. Cylinders made of the insulating material as shown at Fig. 3, being furnished in varving sizes to fit cooking receptacles that may e usedgand adapted to nest one within another and to snugly fit the cooker, the supporting plates, and pads all fitting snugly within the members to which they are adapted and the cover tightl fitting over all, enable the user to tlght y pack the cooking receptacles in' insulating material. and the coo er to be tightly packed with the receptacles and insulating material. The sectional view. Fig. 1, shows a cooker with three compartments for cooking, but it is evident that the dereceptacles,

vice can be made with more or less compartments as desired, and still maintain the same mode of construction. Various forms of finish can be applied to the outside of the cooker to give it a pleasing appearance. The inside of the cooker, the cylinders and lates to be covered with a coating of iquid asbestos.- I am aware that rior to my invention hreless cookers have made with inclosng cases, 1nsulating material packed therein, comprising structures that are relatively heavy, costly and not easily transported, but I do not know that an one has heretofore produced a practical, ightweight, portable reless cooker made prmci ally of paper and corrugated board speciall prepared to render the same an insulator 0 heat and air; a fireless cooker in which the insulating material and casing are all in one, so economical in cost and so portable that almost anyone can use it to advantage whether enga d in housekeeping or not. he preferable 'form of the device is cylindrical, as the materialcan be easil rolled into this shape, butitcan. be ma a into other forms; The solution preferred by the inventor consists of one part'of commercial waterglass to six arts. of water, but these proportions could varied, or an equivalent used. In fastening the parts tother glue is used, but other means could e emp oyed. It is evident that various .changes in the details of construction'and in the arrangements of parts can bemade by those skilled in the art without de arting from the spirit of my invention, an therefore I do not wish to be limited to the exact disclosure, except as is required by the claims. a

I claim:

1. A'lightweight fireless cooker comprising a body member and utensil inclosing members com osed of corrugated strawboard alternating with sheets of paper and so assembled in said members as to make a series of air cells extending longitudinal?- therethrough, top, bottom and utensil ho ing members adapted to fit within the body member, com osed of sections of corrugated strawboard a ternating with sheets of paper and wherein each section of corrugated strawboard is laid so that the corrugations thereof lie transverse to the corrugations of the next section of corrugated strawboard, all of said material having been impregnated with a solution of wat rglass, means for fastenin said material together. means for sealing tie cells in the structure, means for strengthenin the body member and applying handlcs t ereto.

2. A device of the class described, comprising in combination, a body member of cylindrical form, a bottom member, a top member, cooking receptacle supporting memforming annular recesses on the inner peripher of the body member, amiular members a apted to fit over said recesses, seal the cells therein and to afford a seat for the utensil holding members, means for sealing the cells in the structure adapted to form dead air spaces therem, means for fastening said material together, a flat metallic band extendin around the body member, the free ends of w ich are bent substantially at right angles and adapted to extend up each side of the body member and underneath said first band, said bands adapted to stren hen the structure and afford means for app ying handles thereto, said bands and the outer periphery of said structure covered With said prepared material.

5 3. The combination with a fireless cooker, of detachable cooking receptacle inclosing members, open at each end, composed of corrugated stranboard alternating with sheets of paper and so assembled in said members as to make a series of air cells extendin longitudinally therethrough, said material. having been impregnated with a solution of watel-glass, oppositely disposed recesses in the interior of said members adapted to receive projections of cooking receptacles, means for fastening said material together, said members adapted to nest together within the cooker and serve as insulators for cooking vessels of varying sizes.

CHARLES F. HANSEN. 

